The mandatory SOAP Envelope element is the root element of a SOAP message.
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The SOAP Envelope Element
The required SOAP Envelope element is the root element of a SOAP message. It
defines the XML document as a SOAP message.
Note the use of the xmlns:soap namespace. It should always have the value of
:
http://www.w3.org/2001/12/soap-envelope
and it defines the Envelope as a SOAP Envelope:
<?xml version="1.0"?>
<soap:Envelope
xmlns:soap="http://www.w3.org/2001/12/soap-envelope"
soap:encodingStyle="http://www.w3.org/2001/12/soap-encoding">
  ...
  Message information goes here
  ...
</soap:Envelope>
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The xmlns:soap Namespace
A SOAP message must always have an Envelope element associated with the "htt
p://www.w3.org/2001/12/soap-envelope" namespace.
If a different namespace is used, the application must generate an error and
discard the message.
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The encodingStyle Attribute
The SOAP encodingStyle attribute is used to define the data types used in th
e document. This attribute may appear on any SOAP element, and it will apply
to that element's contents and all child elements. A SOAP message has no de
fault encoding.
Syntax
soap:encodingStyle="URI"
Example
<?xml version="1.0"?>
<soap:Envelope
xmlns:soap="http://www.w3.org/2001/12/soap-envelope"
soap:encodingStyle="http://www.w3.org/2001/12/soap-encoding">
...
Message information goes here
...
</soap:Envelope>
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